About this site
The source
- Provider of Services File — Clinical Laboratories, Centers for Medicare & Medicaid Services. File for Q2 2026; latest record dated Jun 29, 2026.
- Names of the codes: the CMS data dictionary of the file.
The file is a work of the United States government and is in the public domain. CMS publishes a new one every quarter; this site is rebuilt from it.
What this site is not
- Not CMS, and not affiliated with or endorsed by any government agency.
- Not a ranking and not a rating: lists are alphabetical, and a certificate is not a grade.
- Not a directory of people: a laboratory named only after a person is not listed on any page.